THE FOEAMINIFERA OF THE ATLANTIC OCEAIN 



MILIOLIDAE, OPHTHALMIDIIDAE, AND FISCHERINIDAE 



By Joseph Augustine Cushman 



Of Sharon, Massachusetts 



INTRODUCTION 



This sixth part of the work on the Atlantic Foraminifera deals with 

 the Miliolidae, Ophthalmidiidae, and Fischerinidae, families closely 

 allied to one another with imperforate tests. Since the earlier parts 

 of this work were written, a new classification which has been in 

 process for some years has been finished and published.^ In order 

 to have the earlier portions fit into the new classification, it is neces- 

 sary to go over them in outline, and this is here done in the following 

 pages. A table showing the relationships of the families as at present 

 used is also given. The following two parts of this work will take 

 up the remaining families so that all will be included in eight parts 

 as originally planned. 



The Classification of the Foraminifera here adopted is that which 

 I have recently published.^ In brief outline the early parts of the 

 Atlantic Foraminifera Bulletin 104, United States National Museum, 

 parts 1-5 are here reviewed and the position of the various genera 

 and sometimes species is indicated in the new classification. In this 

 way the earher portions may be brought into line with the later ones 

 by the student using them. Only those genera are mentioned whose 

 species are included in the Atlantic work. 



Family 1. ALLOGROMIIDAE 



As the specimens of this family do not occur in the Albatross 

 dredgings which form the chief source of material for this work, they 

 are not included. 



Family 2. ASTRORHIZIDAE 



Test free, consisting of a central chamber from which radiate 

 tubular channels to the exterior, either simple or branching; wall with 

 a thin chitinous inner layer on all or part of which is agglutinated 



'Cushman, Foraminifera, Their Classification and Economic Use, Special Publ. No. 1, Cushman Lab- 

 oratory for Foraminifera! Research, 1928, pp. 1-401, pis. 1-59. 



